116 lines
3.2 KiB
C++
116 lines
3.2 KiB
C++
/* Copyright (C) 2023 Mike Fleetwood
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "common.h"
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#include <iostream>
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#include <sstream>
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#include <string>
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#include <iomanip>
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#include <stddef.h>
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#include <ctype.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <errno.h>
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#include <string.h>
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#include <unistd.h>
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namespace GParted
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{
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// Format up to BinaryStringChunkSize (16) bytes of binary data ready for printing as:
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// Hex offset ASCII text Hex bytes
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// "0x000000000 \"ABCDEFGHabcdefgh\" 41 42 43 44 45 46 47 48 61 62 63 64 65 66 67 68"
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std::string binary_string_to_print(size_t offset, const char* s, size_t len)
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{
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std::ostringstream result;
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result << "0x";
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result.fill('0');
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result << std::setw(8) << std::hex << std::uppercase << offset << " \"";
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size_t i;
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for (i = 0; i < BinaryStringChunkSize && i < len; i++)
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result.put((isprint(s[i])) ? s[i] : '.');
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result.put('\"');
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if (len > 0)
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{
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for (; i < BinaryStringChunkSize; i++)
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result.put(' ');
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result.put(' ');
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for (i = 0 ; i < BinaryStringChunkSize && i < len; i++)
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result << " "
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<< std::setw(2) << std::hex << std::uppercase
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<< (unsigned int)(unsigned char)s[i];
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}
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return result.str();
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}
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// Re-execute current executable using xvfb-run so that it provides a virtual X11 display.
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static void exec_using_xvfb_run(int argc, char** argv)
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{
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// argc+2 = Space for "xvfb-run" command, existing argc strings plus NULL pointer.
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size_t size = sizeof(char*) * (argc+2);
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char** new_argv = (char**)malloc(size);
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if (new_argv == NULL)
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{
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fprintf(stderr, "Failed to allocate %lu bytes of memory. errno=%d,%s\n",
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(unsigned long)size, errno, strerror(errno));
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exit(EXIT_FAILURE);
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}
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new_argv[0] = strdup("xvfb-run");
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if (new_argv[0] == NULL)
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{
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fprintf(stderr, "Failed to allocate %lu bytes of memory. errno=%d,%s\n",
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(unsigned long)strlen(new_argv[0])+1, errno, strerror(errno));
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exit(EXIT_FAILURE);
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}
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// Copy argv pointers including final NULL pointer.
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for (size_t i = 0; i <= (unsigned)argc; i++)
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new_argv[i+1] = argv[i];
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execvp(new_argv[0], new_argv);
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fprintf(stderr, "Failed to execute '%s %s ...'. errno=%d,%s\n", new_argv[0], new_argv[1],
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errno, strerror(errno));
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exit(EXIT_FAILURE);
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}
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// Ensure there is an X11 display, providing a virtual one if needed.
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void ensure_x11_display(int argc, char** argv)
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{
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const char* display = getenv("DISPLAY");
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if (display == NULL)
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{
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printf("DISPLAY environment variable unset. Executing 'xvfb-run %s ...'\n", argv[0]);
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exec_using_xvfb_run(argc, argv);
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}
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printf("DISPLAY=\"%s\"\n", display);
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}
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} //GParted
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